/*!
 * jQuery resize event - v1.1 - 3/14/2010
 * http://benalman.com/projects/jquery-resize-plugin/
 * 
 * Copyright (c) 2010 "Cowboy" Ben Alman
 * Dual licensed under the MIT and GPL licenses.
 * http://benalman.com/about/license/
 */

// Script: jQuery resize event
//
// *Version: 1.1, Last updated: 3/14/2010*
// 
// Project Home - http://benalman.com/projects/jquery-resize-plugin/
// GitHub       - http://github.com/cowboy/jquery-resize/
// Source       - http://github.com/cowboy/jquery-resize/raw/master/jquery.ba-resize.js
// (Minified)   - http://github.com/cowboy/jquery-resize/raw/master/jquery.ba-resize.min.js (1.0kb)
// 
// About: License
// 
// Copyright (c) 2010 "Cowboy" Ben Alman,
// Dual licensed under the MIT and GPL licenses.
// http://benalman.com/about/license/
// 
// About: Examples
// 
// This working example, complete with fully commented code, illustrates a few
// ways in which this plugin can be used.
// 
// resize event - http://benalman.com/code/projects/jquery-resize/examples/resize/
// 
// About: Support and Testing
// 
// Information about what version or versions of jQuery this plugin has been
// tested with, what browsers it has been tested in, and where the unit tests
// reside (so you can test it yourself).
// 
// jQuery Versions - 1.3.2, 1.4.1, 1.4.2
// Browsers Tested - Internet Explorer 6-8, Firefox 2-3.6, Safari 3-4, Chrome, Opera 9.6-10.1.
// Unit Tests      - http://benalman.com/code/projects/jquery-resize/unit/
// 
// About: Release History
// 
// 1.1 - (3/14/2010) Fixed a minor bug that was causing the event to trigger
//       immediately after bind in some circumstances. Also changed $.fn.data
//       to $.data to improve performance.
// 1.0 - (2/10/2010) Initial release
(function(factory) {
    if (typeof define === 'function' && define.amd) {
        // AMD Registration
        define([ 'jquery' ], factory);
    } else {
        // Browser globals
        factory(jQuery);
    }
}(function($) {
  (function($,window,undefined){
    '$:nomunge'; // Used by YUI compressor.

    // A jQuery object containing all non-window elements to which the resize
    // event is bound.
    var elems = $([]),

      // Extend $.resize if it already exists, otherwise create it.
      jq_resize = $.resize = $.extend( $.resize, {} ),

      timeout_id,

      // Reused strings.
      str_setTimeout = 'setTimeout',
      str_resize = 'resize',
      str_data = str_resize + '-special-event',
      str_delay = 'delay',
      str_throttle = 'throttleWindow';

    // Property: jQuery.resize.delay
    //
    // The numeric interval (in milliseconds) at which the resize event polling
    // loop executes. Defaults to 250.

    jq_resize[ str_delay ] = 250;

    // Property: jQuery.resize.throttleWindow
    //
    // Throttle the native window object resize event to fire no more than once
    // every <jQuery.resize.delay> milliseconds. Defaults to true.
    //
    // Because the window object has its own resize event, it doesn't need to be
    // provided by this plugin, and its execution can be left entirely up to the
    // browser. However, since certain browsers fire the resize event continuously
    // while others do not, enabling this will throttle the window resize event,
    // making event behavior consistent across all elements in all browsers.
    //
    // While setting this property to false will disable window object resize
    // event throttling, please note that this property must be changed before any
    // window object resize event callbacks are bound.

    jq_resize[ str_throttle ] = true;

    // Event: resize event
    //
    // Fired when an element's width or height changes. Because browsers only
    // provide this event for the window element, for other elements a polling
    // loop is initialized, running every <jQuery.resize.delay> milliseconds
    // to see if elements' dimensions have changed. You may bind with either
    // .resize( fn ) or .bind( "resize", fn ), and unbind with .unbind( "resize" ).
    //
    // Usage:
    //
    // > jQuery('selector').bind( 'resize', function(e) {
    // >   // element's width or height has changed!
    // >   ...
    // > });
    //
    // Additional Notes:
    //
    // * The polling loop is not created until at least one callback is actually
    //   bound to the 'resize' event, and this single polling loop is shared
    //   across all elements.
    //
    // Double firing issue in jQuery 1.3.2:
    //
    // While this plugin works in jQuery 1.3.2, if an element's event callbacks
    // are manually triggered via .trigger( 'resize' ) or .resize() those
    // callbacks may double-fire, due to limitations in the jQuery 1.3.2 special
    // events system. This is not an issue when using jQuery 1.4+.
    //
    // > // While this works in jQuery 1.4+
    // > $(elem).css({ width: new_w, height: new_h }).resize();
    // >
    // > // In jQuery 1.3.2, you need to do this:
    // > var elem = $(elem);
    // > elem.css({ width: new_w, height: new_h });
    // > elem.data( 'resize-special-event', { width: elem.width(), height: elem.height() } );
    // > elem.resize();

    $.event.special[ str_resize ] = {

      // Called only when the first 'resize' event callback is bound per element.
      setup: function() {
        // Since window has its own native 'resize' event, return false so that
        // jQuery will bind the event using DOM methods. Since only 'window'
        // objects have a .setTimeout method, this should be a sufficient test.
        // Unless, of course, we're throttling the 'resize' event for window.
        if ( !jq_resize[ str_throttle ] && this[ str_setTimeout ] ) { return false; }

        var elem = $(this);

        // Add this element to the list of internal elements to monitor.
        elems = elems.add( elem );

        // Initialize data store on the element.
        $.data( this, str_data, { w: elem.width(), h: elem.height() } );

        // If this is the first element added, start the polling loop.
        if ( elems.length === 1 ) {
          loopy();
        }
      },

      // Called only when the last 'resize' event callback is unbound per element.
      teardown: function() {
        // Since window has its own native 'resize' event, return false so that
        // jQuery will unbind the event using DOM methods. Since only 'window'
        // objects have a .setTimeout method, this should be a sufficient test.
        // Unless, of course, we're throttling the 'resize' event for window.
        if ( !jq_resize[ str_throttle ] && this[ str_setTimeout ] ) { return false; }

        var elem = $(this);

        // Remove this element from the list of internal elements to monitor.
        elems = elems.not( elem );

        // Remove any data stored on the element.
        elem.removeData( str_data );

        // If this is the last element removed, stop the polling loop.
        if ( !elems.length ) {
          clearTimeout( timeout_id );
        }
      },

      // Called every time a 'resize' event callback is bound per element (new in
      // jQuery 1.4).
      add: function( handleObj ) {
        // Since window has its own native 'resize' event, return false so that
        // jQuery doesn't modify the event object. Unless, of course, we're
        // throttling the 'resize' event for window.
        if ( !jq_resize[ str_throttle ] && this[ str_setTimeout ] ) { return false; }

        var old_handler;

        // The new_handler function is executed every time the event is triggered.
        // This is used to update the internal element data store with the width
        // and height when the event is triggered manually, to avoid double-firing
        // of the event callback. See the "Double firing issue in jQuery 1.3.2"
        // comments above for more information.

        function new_handler( e, w, h ) {
          var elem = $(this),
            data = $.data( this, str_data );

          // If called from the polling loop, w and h will be passed in as
          // arguments. If called manually, via .trigger( 'resize' ) or .resize(),
          // those values will need to be computed.
          data.w = w !== undefined ? w : elem.width();
          data.h = h !== undefined ? h : elem.height();

          old_handler.apply( this, arguments );
        };

        // This may seem a little complicated, but it normalizes the special event
        // .add method between jQuery 1.4/1.4.1 and 1.4.2+
        if ( $.isFunction( handleObj ) ) {
          // 1.4, 1.4.1
          old_handler = handleObj;
          return new_handler;
        } else {
          // 1.4.2+
          old_handler = handleObj.handler;
          handleObj.handler = new_handler;
        }
      }

    };

    function loopy() {

      // Start the polling loop, asynchronously.
      timeout_id = window[ str_setTimeout ](function(){

        // Iterate over all elements to which the 'resize' event is bound.
        elems.each(function(){
          var elem = $(this),
            width = elem.width(),
            height = elem.height(),
            data = $.data( this, str_data );

          // If element size has changed since the last time, update the element
          // data store and trigger the 'resize' event.
          if ( width !== data.w || height !== data.h ) {
            elem.trigger( str_resize, [ data.w = width, data.h = height ] );
          }

        });

        // Loop.
        loopy();

      }, jq_resize[ str_delay ] );

    };

  })($,this);
}));
